Error making certificate request

I’m trying to create CSR by following the instructions at this link.

OpenSSL: Create a private key and a Certificate Signing Request (CSR) (simplified) (ifs.com)

I downloaded openSSL and created create_clickonce_csr.cmd. After running cmd command I get this error:

Error making certificate request

5C580000:error:06800098:asn1 encoding routines:ASN1_mbstring_ncopy:string too short:crypto\asn1\a_mbstr.c:100:minsize=1

Afte this error it says:

Certificate Signing Request (CSR) created successfully. 

Please see the details in the screen shot attached. My questions are:

1. How to fix the error?
2. Where to find the generated CSR files?